Bed



FIG. 1 is a front elevational view of a bed, showing my new design, the mattress is shown in broken lines and forms no part of the claimed design;

FIG. 2 is a right side elevational view, the left side being a mirror image thereof;

FIG. 3 is a perspective view thereof; and,

FIG. 4 is a rear elevational view thereof. 

The ornamental design for a bed, as shown and described. 